Road-roller.



F. F. WILLIAMSON & D. BRENNAN, JR.

ROAD ROLLER.

APPLICATION FILED DEC. 24, 1908.

v Patented May 17, 1910.

QITQWQTTJWWW vwe Mow Fmsasmcx F. WILLIAMSON UNITED STATES PATENT OFFTQE FREDERICK F. WILLIAMSON A ND DANIEL BRENNAN, JR, 0F NEW YORK, N. 51., AS-

SIGlfORS TO THE SICILIAN ASPHALT PAVING COMPANY, OF NEW YORK, 31. Y.,, A.

CORPORATION 01: NEW YORK.

Specification of Letters Patent.

. 01mins] lpplica'tim fled lay 2, 1908, Serial No. $30,483. Divided ant this application filed Member 24,

SerialNe. 469,069.

ROAD-ROLLER.

Patented-May 1'7, 1910,

To all whom it may comm:

Be it known that we, Fnnomon F. WIL- Lmresoiv and DANIEL BRENNAN, J12, both citizens of the United States, and residents of the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Road- Rollers, of which the following is a specificatron.

Our invention relates to road rollers and has for its object to enable a rollerof comparatively small weight to perform work such as would usually rcuire' a roller of much greater weight and a so to perform a peculiar classifying or distributing action on the stones. In the accompanying drawings Figure 1 is a partial plan View showing one form of our improved roller and Fig. 2 is a top View showing another form of such roller.

Our present application is a divisionofanother application filed by us in the United States Patent Office on May 2nd,1908, Serial issued on Jan. 12, 1909.

Our improved roller, in the form illustrated by Fig. 1, is provided with a number of ribs or annular ridges A having inclined No. 430,463, on which Patent #909,499 was faces A on the sides of each rib or ridge.

The width of the cylindrical surface of a rib should be about one-third of the interval between said surfaces, or in other words, the aggregate width of these cylindrical surfaces should be about one-fourth of the rollers len h. In order to obtain the best results wit our roller, the depth of the groove between said ribs should notbe over one-half of the intended thickness of the top la er of the road in its finished condition; hen a roller of this character travels over stones laid loosely, that is without any binder, or over a layer of stones in which a binder has been incorporated, an improved result issecured by reason of the fact that the rolling operationbrings about what may be called a classification of the material, that is, the larger stones are brought to the surface, while the smaller ones seek lower levels. This action may be explained as follows: If the layer of stone contains no binder, the

- roller at first pushes a wave of loose stones of the mass by gravity whereby also the coarser stones are to that extent raised; then as the pressure of the roller comes on the edge of a stone, that stone is tilted up to an extent in proportion to its size and smaller pieces get under the tilted end, By a repetition of this: action the stones are soon graded the larger ones being forced to collect at thehaving of course two edges. A disk roller,

as we may call it, as designed for our purpose, of the same weight and general dimensions as a plain roller, would be composed r for instance of 16 disks having 32 angular edges, the aggregate rolling faces of the disk having four times the pressure on the road of a plain roller of the same size and weight. The tilting effect of the edges of a rid e or ring on the stones in the layer is manifestly much greater than can be produced'by the rolling face thereof, as after the stone is tilted up the roller passes by and gives time for small stuff to get under the tilted up end and very often forces smaller pieces under such raised-end by reaction. This kind of a roller will not ush so much of a wave in front of it as a at roller does, but induces a complexity of movements in the mass whereby the stones soon become classified and find their best fitting places in the layer, the larger ones on top, thus with this form of roller the resistance of the soft asphalt to the classification of the stones into position is overcome and it progresses rapidly to completion. The edges or ridges of the roller out into the mass at first to the full depth thereof, but at each succeeding time of going over they cut in less and less, and finally do not cut in at all, leaving the surface smooth with the best stones face up as described. The inclined faces A adja cent to each of said edges or ridges, assist in crowding the stones sidewise so as to facilitate their rearrangement and classification, These inclined faces give an outward flare to the groove formed between two adjacent ridges or ribs and thus avoid the danger of stones stickin between such ribs as they might if the llbS had parallel side surfaces per endicular to the axis of the roller.

he machine of which the curved roller forms the working part may be a self-propelled one of the usual character; Its steer mg roll may be plain and not grooved .so

that it will flatten'out the :grooves'made at first by the main roller. I

We prefer to provide means whereby the surface of the roller may be kept clean.v We have illustrated a special construction of such means in conjunction with a somewhat different form of our roller, shown in Fig.

2, which is characterized b the employment of s iral ribs A in lieu 0 the annular ribs of ig. l. The cleaning devicein this case consists of a chain. B suitably carried by the frame C of the roller, the links of said chain being shaped to conform to the outline of the ribs A Ofcourse, as theroller rotates, the chain will be moved slowly and the grooves between the spiral ribs as well as the faces of said ribs-will be -kept clean. With a roller havi annular ribs, as in Fig.

: .1, a simple toothe bar B secured to the road the frame in such a way that its teeth would project between the ribs of the roller would e sufliclent'. The spirally ribbed roller of Fig. 2 has the advantage of a tendency to crowd the covering center, which is o ing ridgesse arated by grooves, 1n combination withva 0 sin mounted to travel substantially'parallel with the rollers axis and rovided with teeth fitted into the rollhrs grooves. 1

In witness whereof we have hereunto set our hands in the presence of two subscribng'witnesses. Y

FREDERICK F. WILLIAMSON. v

DANIEI}; BRENNAN, R.

Witnesses:

- Jorm Lorna, Jonn'LoKsmin gnsom 

